USB-2020 Hardware User’s Guide
Ver. 1.0
USB Audio Device with HID
Last Modified 06/20/2009
USB-2020 Specification
Audio Output 3.5mm stereo phone jack
Output Channels Mono, Stereo(L + R)
Resolution 8-bit, 16-bit
Sampling Frequency 32, 44.1, 48 kHz
THD+N < 0.02% (0 dB), < 3% (-60dB)
SNR > 87 dB
Output Voltage 3 Vrms
Output Current 30mA
Audio Input 3.5mm stereo phone jack
Input Channels Mono, Stereo(L + R)
Resolution 8 bits, 16 bits
Sampling Frequency 8, 11.025, 16, 22.05, 32, 44.1, 48 kHz
THD+N <0.1% (0 dB)
SNR > 80 dB
Input Voltage 1.4 Vrms
Input Impedance 10k Ohm
Condenser Microphone Bias
Yes
USB 1.1, 12MHz full-speed, fully compliant with USB 2.0 specification
HID volume up, volume down and mute buttons
External power input voltage 10 ~ 30 V DC
Power consumption 1.8W max.
Auto switching USB/External power
USB-2020 Wire Connection
Front View
Power LED
A red LED as power indicator
USB Connector
B type, connect to Host(PC)
Volume UP
Volume Down
Mute
HID buttons, link to system’s mixer,
only workable when your system has
load audio mixer.
Audio Out
Connect to earphone or speakers.
Driving efficiency is 60mW, it can drive
passive speakers directly.
Audio In
Connect to Condenser Microphone
Bottom View
F.G.
Frame Ground. It’s optional. If you use this pin, it
can reduce EMI radiation; improve EMI
performance and ESD protection.
GND
+Vs
Power input (+10V ~ +30V DC). It’s optional. If you
use an external power, it can reduce noise from
host’s USB power, and get better audio
performance.
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